Related Experiment Video
Updated: Jun 14, 2026

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
Published on: February 19, 2021
Disclosure of unknown harms in magnetic resonance imaging research
1Dalhousie University, Health Law Institute, Halifax, Nova Scotia, Canada. jennifer.marshall@dal.ca
Abstract:
Unknown harms are by their nature difficult to communicate. While magnetic resonance imaging (MRI) has known risks (e.g., metal projectiles, dislodgement of medical implants), this imaging modality also has potential unknown long-term negative health effects associated with its static magnetic fields. We carried out a research ethics board (REB) file review of previously approved MRI research studies and found that unknown risks were either left undisclosed or were inadequately disclosed to research participants and REBs. This article outlines issues raised by our REB file review and suggests steps that should be taken in order to satisfactorily communicate information about potential unknown harms of MRI.
Insights
Communicating unknown risks from magnetic resonance imaging (MRI) is challenging. A review found that potential unknown harms of MRI were often not disclosed to participants or research ethics boards (REBs).
Area of Science:
- Medical Imaging
- Bioethics
- Patient Safety
Background:
- Magnetic Resonance Imaging (MRI) poses known risks like projectile effects and implant displacement.
- Potential unknown long-term health effects from MRI's static magnetic fields remain a concern.
- Effective communication of these unknown risks is inherently difficult.
Purpose of the Study:
- To investigate the disclosure of unknown risks in previously approved MRI research studies.
- To identify issues related to the communication of potential unknown harms of MRI to participants and research ethics boards (REBs).
- To propose improvements for satisfactorily communicating information about unknown MRI harms.
Main Methods:
- A research ethics board (REB) file review was conducted.
- Analysis focused on previously approved MRI research studies.
- The review assessed the adequacy of disclosure regarding unknown risks.
Main Results:
- Unknown risks associated with MRI were frequently left undisclosed in research files.
- Disclosure of potential unknown harms to research participants was often inadequate.
- Information provided to REBs regarding unknown MRI risks was also insufficient.
Conclusions:
- Current practices inadequately address the communication of unknown MRI risks.
- There is a need for improved strategies to inform participants and REBs about potential unknown harms.
- Enhanced disclosure methods are crucial for ethical MRI research conduct.
Related Concept Videos
Magnetic Resonance Imaging
Imaging Studies I: CT and MRI
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Imaging Studies for Cardiovascular System IV: CMRI
Imaging Studies IV: Magnetic Resonance Imaging

